Rotary scraping-tool.



M. F. POWELL.

ROTARY SCRAPING TOOL.

APPLICATION FILED sPPT.so,1912.

1,053,215. Patented Feb. 18,1913.y

MYRfrnLLo r. POWELL, or OMAHA, NEBRASKA.

no'mrscnarms-roor..

Specicati'on of Letters @Patent Application led September 30, 1912. Serial No. 723,091.

To a?? whom 'it may concern:

Be it known that I, MYRTELLO F. POWELL, a citizen of the lUnited States, residing at Omaha, in the county of Douglas and State of Nebraska. have invented certain new and useful llnprmements in Rotary Scraping- Tools, of which the following is a specification.

This invention relates to a rotary scraping tool particularly adapted for use in connection with steam boilers of the class employing water-tubes which communicate with a main reservoir. ln the construction of-these boilers an outer cfn'itaining-wall is provided having numerous hand-holes formed therein se that t-he tubes or pipes may be inspected or cleaned, a stopper or head being provided for and removably mounted in each handhole. `It is obvious, therefore, that exactness is required in the matter of the bearings ofthese parts, to prevent escape ofthe con,- tents of therboiler. As is well known, rust or scale which gradually forms upon the inner surface of the containingwall of boilers of u'this class, operatesto prevent a proper seating of the annular surface of thev Stoppers or heads with the containing-wall, adjacent to the hand-hole openings; fand during replacement of the heads in these openings, at times when inspecting or cleaning the pipes or tubes, it frequently happens that the, accumulated, hardened-deposits or scale will be interposed between the containing-wall and the surface ofthe heads to prevent a. suitable bearing or contact. of these parts.

The object ofthe invention is to provide an improved tool for scraping the inner surface of the containing-*wall adjacent to these circular hand-holes, such tool to be automatic-in operation for providing an adequate pressure and contact with the surface to-be scraped; also to be convenient -in opferation, and toconsist of few and simple parts so that i-t may be economically con-v structed.

With these objects in view and others 'tobementioned, the invention presents a novel,

construction, combination and arrangement of parts, as described herein and claimed, and l asillustrated inthe drawing,`it being underv -stood that changes in forni, size,.proportion and minor details may be made within thev scope of the claims, without departing from the spirit .of the invention. or sacrificing any of its advantages.

In the drawing, Figure'l is a side view of' a scraping tool embodying my invention. Fig. 2 is a side view of the tool, the spring Abeing compressed to cause a pressure of the scraper blade agalnst the inner surface ofl the containing-wall of the boiler, said wall being Ain section. Fig. 8 is a view somewhat similar to Fig. 2 to show an edgewise view of the lever-arms, the -slidable bearing-head being in section and the crank omitted. Fig. tis an enlarged end view of the bearinghead, being a transverse section taken between lines 4 and i of Fig. l. Fig. 5 is a view similarto Fig. 4, with the exception that only three prongs are shown for the bearing-head.

Referring now to the drawing for a more particular description, numeral .6 indicates thev containing-wall of a steam Aboiler as above referred to, one of the circular handholes mentioned being indicatedat 7, the inner surface a of the wall generally being fiat, but subjected to such exposure that rust and. scale forms thereon, and for the removal of these deposits or adhesions, the herein described tool is provided. A'

The complete tool, best shown in Fig. l, consists, briefly, of a bar or shaft 8 provided at its outer terminal with a crank 9. its inner terminal having a cutter or elongated bladev 10 mounted thereon, this mounting or connection being by means of. any suitable universal joint 11, a bearing-head 12 being slid ably mounted upon the shaft and adapted to be moved in one direction by a 'compound lever 13, this lever to be manually operated to cause a resilient 'member or spiral spring 14 to be compressed between the movable collar 15 and the' bearinghead. y

The compound lever consists, in part, of

.the pair of arms or links b having their inner ends pivotally mounted, at points op positeto each other, upon collar 16 which yis disposed adjacent to the crank and keyed on the. shaft, and the pairofflink's c having their inner ends pivotal1y"mounted at points opposite to each other upon the slidable'collar 15, 1theouter ends 'of links?) being c onnected with' and between the ends of links o `ivots d, an extension or by anysuitable handle e preferab y of loop-form or U-sh'ape beingprovided and having its inner ends rigidly mounted'upon links Za as best shown in v-Fig. ,3. g. As thus described, links b are Patented Feb. 18,1913.

disposed parallel with reference `to4 each" other, and when swung they willl move asia unit, andthe saine is true with reference to jlinks c. Links c are provided at their ter- .minals, outwardly of verse,- inwardly-project-lng lugs f, and when ,5 these lin-ks are .swung inwardly and are disposed as shown in Figs. 2 and 3, said lugs `may bear upon and between the ends of links V b in a manner to preventia further inwardlyswinging movement of links b and c.' .'10' #The arms of handle e are preferably di'si posed upon the inner sides of links b and they -are formedf'with a curvature 'at g so that when links b and c are swung inwardly, the, handle may lie adjacent to .t-he movable v colla-r 15. Links c are-preferably disposed outwardly of links b, and in order that these links may be disposed in. parallel planes so that, they may have suitable ,bearings of theirsides againsteach other, and so that4 lugs.)c may make suitable engagements with nks b, collar 16 isconstructed of a less f diameter :thancollafr 15. i

"'The bearing-head consists of a sleeve lh provided with fingers orprongs z', each S25, prongprojecting substantially parallel with and rearwardly of the sleeve andhaving a" terminal, segmental ledge 'y' with an adjacent, outwardly-projecting or; peripheral lug k.

"'.vInaFigg 'only three `of Ithese prongs and so vledges are shown, and Ido not :wish to linit 'myself to" any exact number.- In.- instances where the'surfac'e of the. containing-wall of the boiler is quite`roughthree'reffgtheprongs fare preferred to--agreater nuinber, so that tilting or vibration maybe avoided;

l f. `The bladelO .obviously` must have alength greater than thef-diameterofthe hand-hole,

" and when the yparts aref arranged Yas shown -in Figs. 2 andl3, the blade-will be disposed substantially at a right angles 'to lthe*- shaft. By Yreferencefto Figal, itv willbe seen'that when the handle e` isswun'goutwardly from l l i the' shaft 8, the bearing-head maybe. moved i' forwardlyV upon the shaft, y and` the I bladel 10 y l" may then be swung to `a position substantially parallel with said shaft,` one of the j being disposed withinlthe hand-hole 7.

y'Handle e is then swung inwardly and "to a position substantially parallel with the shaft 8'tocausea sliding v'movement of collar p15 ce in adirection of the bearing-head, and to causefa compression 'of spring 14 betweensaid collar and bearing-head. The opera- I I `tion a's'described AWillcausefthe lugs k to ber come firmly' pressed against the-.wall 6 on *ijje account of the forceof the spring 14, the.

pivots d with trans-l f swinging movement 'of the handle outwardly blade 10 resisting this force and therefore .being held in contact with the surface to be scraped. -By use of the crank at this time, the shaft may be rotated, and the knife will remove 'the hardened deposits, rust or scale 7,0

veryquickly and eifectively, one or two ro tations generally being sufficient. It will be noted that `when the parts are disposed as shown in Figs. 2 and 3, the pivotal mountthe spring will, on this account, remaincompressed without any attention of the operator, lugs ,t engaging links b, and each of the pairs of links remaining in interlocked relation until handle e is swung outwardly from the shaft-,to the position shown in Fig. 1. It will be understoodthat,during the operation of scraping, shaft 8 will be disposed 35 horizpntally.; and by reason of the compression of the sprin 14 and the arrangement of parts as described, the tool will not require any support by or attention from an operator, but will be firmly held in a hori- 9o zontal position, so that the crankmay'be operated; and since, the handlee vatfthis time, is disposed near to the shaft andsubstantially parallel therewith', it is not obtrusive and does not interfere with the movementof the crank when the shaft is rotated.

At 17,` disposed uponthe shaft 8 between collars 15 and' 16, isa second spiral spring. Itis for the purpose of preventing `an undue from the shaft ina direction of the crank,

and -it vprei-ents binding or pressure of the collar upon shaft 8. `While itis desirable that collar 15 may slide forwardly or rearwardly` upon the shaft" under control of the lever,- said collar should be maintained, normally, inf apositionadjlacent vto and not too near to collar'l, so that it will, at all times, vbefn'ear to the, end of` spring 1 4 and in a posit-ion to readily cause a compression of that springwhen moved bythe lever, and

`by'.v operation ofsaid spring 1T theseresults are attained. *1. t

lVhile I have shownthe handle e rigidly mounted upon links b, theoperation would be `effective if'mountediup'on links @,Land therefore I do not wish to limit myself tol Athe exact construction illustrated; and while the handle e and links 1b are 'shown as Itwo connected parts they, may be 'formed -of a 120 single' metallic bar or strip, if desired. y

' Having fully described the construction of partsy-a'further explanation relating to operation is not necessary.

What I claim and desire to secure by Letupon' thel shaft provided with terminal 130l and `:transversale of by 'thejglaf forv moving .tliebarin cad4 sha `etween the bearingshea'd andz'second towa'r "l maintaining it"adjacentI aidf'vltoj-A tliefg'operation"being thatthesecond ybl de". "1 *"f'" l'i- 'v'.col mayfha've a sliding-movement on the g tool; comprisingin combi; '-a rotatable shaft provid" ongated scraper-"bll il and carried-by bearing-head -mounted upon the shaf -1 a resilient member ldisposed between'-the.

' lever and-bearing-head, .adaptedto be com# pressed for moving the bearing-head toward and for maintaining vit adjacent to' said scraperfblade.

4; 'A scraping tool, comprising, in combi` I nation with arotatlable shaft providedvwith a lever, an elongated scraper-blade having a universal-joint connection midway between its ends `with the shaft, a i bearing-head mounted upon the shaft; a spiral springV dis? i' l .posed upon the shaft between the lever and bearing-head and adapted to vbe compressed by. operation of the lever for movingjthe bearing-head 'in the direction of and -for maintaining it adjacent to said scraperblade 5. Al tool for scraping the inner side of a plate provided with hand-holes, comprising; 45'

in combination with a rotatable shaft having a lever mountedy thereon; a sleeve mounted upon the shaft and provided with substanv tially lparallel prongs with terminal ledges and outwardly projecting Jugs adjacent to the ledges an elongatedblade having anni;

' versal-joint connection with the shafft'Ua-nd with the qoutervside of said plate;

6. A tool for scraping the inner sideof a plate. provided with hand-holes;comprising7 in combination .with 4a rotatable shaft; a' sleeve mounted upon the shaftand provided" with prongs having terminal, segmentallyarranged ledges and outwardlyeprojectmg d withf :gagi hefouter side ofsaidpplate. f i.

v'nationtwith*a revolu-ble'sh'aft havingfa' c ol# ijvided' with he Hrst 'pai r of links and =hav ing their terminls xivotally` mounted upon'I the second -.said collar; -a bladehavi'nga universal-joint connection'-ivith'the shaft; :a second .collar v upon the shaft; a second pair of links piv otally mounted intermediate their ends upon the 'rst vpair of links and pivotally mounted atxone of their ends upon the second collar, vtheir opposite ends being provided with lugs; a bearing-head mounted upon .the shaft; a resilient member carried by the shaftand second collar, saidsec'ond collar being movable byy oneof the movements ofthe rst pair ing-head toward'said blade,` the lugs of the second pair of links moving into engagement with said first pair of links.

shaft provided with a nonsslidable collar; a first pair of links provided with a handle and adapted to'have swinging movements having a universal-joint connection witha ed at one of their vterminals uponthe second collar; a'bearingfhead` mounted upon the shaft, acoiled spring carriedl bythe shaft; said second collar beingmovable by one pf links for 4compressing the coiled spring to cause a sliding 'movement of the bearing; head toward said blade; and cooperating devices arranged for limiting saidswmgmg movements of the first pair` of links.

vlugs adjacent to the ledges; a'blade-member having a universal-joint connect-ion with the 10. .A tool lfor the purpose described, comlar rigidly 'mounted 'thereon'nearfone of its opposite terminaljb'eing pro-.

l iipon the shaf'a first pair of links movably l.

moun-tedvuponfthe rigidly mountedA collar; a tse'cond pair-of links pivotally :mounted upon' *'e'ollnr; bearing-.head mounted upon the f *shaft *al coiled Ispring-mounted upon the'` fl 8. A' scraping tool comprising eva rotatable of links forcompressing the resilient mem' vber 4to cause a sliding movement of the bear@ 9. A scraping tool comprising a revoluble `while lmounted upon said collar; a blade shaft; asecond collar upon the shaft; a sec# 'ond pair .of links having a plvotal connec `tion with the'irst pair of links whlle mount epmpress the spring' for moving the bearing-headlin a' `direction of the" bladeswinging movements while mounted upon disposed intermediate the bearing-head and i -the swinging movements of the rstvpair of prismg, in combination 'with a shaft vhavingl a crank to provide for itsrotat-ion; a scraperblade flexiblyAv mounted at itsmiddle upon 'a terminal ,and movable by the movement of said shaft; a bearing-head mounted upon the shaft; andmeans supported by the shaft and adaptedtobe directed longitudinally thereof.

for applyingaresilient force for `moving andtending to mamtain a pressure upon the bearingehead inthe direction of the scraperblade.' A

11. In a tool-for scraping the interior faces of boiler Walls adjacent the hand hole openings thereof', the combination withv a shaft adaptedto pass'axially through said opening. a transverse tool mounted upon the said shaft of suoli length as to span said opening,`

and resiliently mounted means carried by said shaft and bearing against the exterior boiler wall for drawing saidtool into yielding engagement with the interior face of the boiler. l v Y 12. In a tool for scraping the interior faces of boiler walls adjacentthe hand hole open ings thereof, thecombinationwith a sha-ftv adaptedfto pass axially through said open-4 ings, a transverse tool mounted upon the said shaft ofsuch length asto span `said openings, and resiliently mounted means carried 'by said shaft and bearing -against .the exterior boiler wallfor drawingsaid tool in to yield- 'f ing. engagement with the 'interior' face of the boiler, the mounting of" said -toluppn' said .shaft comprising a universal joint.

A 13. In a toolvfor scraping the interiorfaces of boiler Walls adjacentthe handhole o en# ings thereof, the combination wlth as afty MYRTELLO F. POWELL;

rWitnesses: Q

HIRAM A. S'rmzons, L. M. THOMAS.4 

